Pope Alexander III and the Ambassador - Spinello Aretino
A shorter episode, on a letter from Pope Alexander III to Prester John.
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Sources:
Prester John: The Legend and its Sources, compiled and translated by Keagan Brewer. Taylor & Francis, 2019.
Pope Alexander III (1159–81): The Art of Survival. Taylor & Francis, 2016.
Rachewiltz, Igor de. Papal Envoys to the Great Khans. Stanford University Press, 1971.